package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {
    // 线程ok的情况
    public String paymentInfo_OK(Integer id)
    {
        return "线程池:"+Thread.currentThread().getName()+"paymentInfo_OK,id: "+id+"\t"+"O(∩_∩)O";
    }

    // 服务降级============================
    // 线程超时的情况 超时3毫秒
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = {
            @HystrixProperty(name="execution.isolation.thread.timeoutInMilliseconds",value = "3000")
    })
    public String paymentInfo_TimeOut(Integer id)
    {
        // 有异常不会报异常
        int second = 10/0;
//        int second = 5;
//        try { TimeUnit.SECONDS.sleep(second); } catch (InterruptedException e) { e.printStackTrace(); }
        return "线程池:"+Thread.currentThread().getName()+"paymentInfo_TimeOut,id: "+id+"\t"+"O(∩_∩)O，耗费秒: "+second;
    }
    // 回调函数
    public String paymentInfo_TimeOutHandler(Integer id){
        return "/(ㄒoㄒ)/调用支付接口超时或异常：\t"+ "\t当前线程池名字" + Thread.currentThread().getName();
    }

    // 服务熔断============================
    // 当10秒之内发的请求超过20次会熔断 或 发的请求错误率大于百分之五十 也会熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            // 是否开启断路器
            @HystrixProperty(name="circuitBreaker.enabled",value = "true"),
            // 在滚动时间窗内 断路器熔断的最小请求数
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "20"),
            // 服务器的休眠时间 过了休眠时间 将会处于半开的状态，再次尝试请求
            // 如果请求成功，则断路器为关闭状态，正常通信
            // 如果请求失败，则断路器为开启状态，在过设置的休眠时间时候再次进行请求
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "5000"),
            // 允许请求失败率为百分之五十
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "50")
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id){
        if(id < 0)
        {
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id)
    {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }
}
